Wei Wang, Qiang Li, Yage Pan, Chuanren R. Ye, Xingnian Li, Yingyu Chen, Qiong Tang, Jun Xu, Yanwu Zhu
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引用次数: 0
摘要
当氧化石墨烯(GO)被还原时,还原氧化石墨烯(rGO)薄片的堆叠会导致其比电容远低于石墨烯的理论值。为了解决这个问题,我们使用单宁酸(TA)对 rGO 层膜进行改性,方法是真空过滤溶液中的 GO 和 TA 混合物,然后在 180℃下进行温和的热还原。由于 TA 含有丰富的氧化还原活性官能团,TA 的引入不仅可以缓解 rGO 片层的堆叠,促进 GO 在相对较低温度下的还原过程,还能提供额外的伪电容。在 6 M KOH 电解液中用于双电极对称超级电容器时,TrGO-0.5 的面积电容为 525 mF cm-2,能量密度为 72.2 uWh cm-2,功率密度为 250.9 uW cm-2。在电流密度为 4 mA cm-2 时,经过 10,000 次充电/放电循环后,电容保持率为 91.7%。基于 TrGO-0.5 的纽扣电池以 2 M 1-ethyl-3-methylimidazole tetrafluoroborate (EMIMBF4) 为电解质,显示了点亮三个 LED 的实际应用。
Reduced graphene oxide film modified by tannic acid for high areal performance supercapacitors
When graphene oxide (GO) was reduced, the stacking of reduced graphene oxide (rGO) sheets would lead to far lower of its specific capacitance than the theoretical value of graphene. In order to solve this problem, we use tannic acid (TA) to modify the rGO layered film by vacuum filtration of the mixture of GO and TA in solution, and then mild thermal reduction at 180℃. Due to the rich redox active functional groups of TA, the introduction of TA can not only alleviate the stacking of rGO sheets and promote the reduction process of GO at relatively low temperature, but also provide additional pseudocapacitance. When used for two-electrode symmetrical supercapacitor in 6 M KOH electrolyte, the TrGO-0.5 gives areal capacitance of 525 mF cm−2, and energy density of 72.2 uWh cm−2 at power density of 250.9 uW cm−2. It also has capacitance retention of 91.7% after 10,000 charging/discharging cycles at current density of 4 mA cm−2. The TrGO-0.5 based button cell with 2 M 1-ethyl-3-methylimidazole tetrafluoroborate (EMIMBF4) as electrolyte shows the practical application to light up three LEDs.
期刊介绍:
The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry.
The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces.
The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis.
The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.